Paper-cutting machine.



PATENTED OCT. 18, 1904.

D. T. WADHAMS.Y PAPER CUTTING MACHINE.

APPLICATION FILED OCT. 21. 1903.

2 SHEETSSHEIJT l.

/ V'ENTOR -1zf0mcy N0 MODEL.

, No; 772.544. PATBNTED 001". 18, 1904.

D. T. WADHAMS.

PAPER CUTTING MACHINE.

' APPLICATION FILED OCT. 21, 1903.

N0 MODEL 2 SHEBTB- ET 2.

wm Y Atfomey UNITED STATES minus T. WADHAMS, or oswneo,

Patented October 18, 1904..

NEW YORK, ASSIGNOR TO OSWEGO MACHINE WORKS, OF OSWEGO, NEW YORK.

PAPER-CUTTING MACHINE.

SPECIFICATION forming part of. Letters Patent N0. 772,544, dated October 18, 1904. Application filed October 21, 1903. Serial No. 177,937. (No model.)

, To all whom it may concern:

Be it known that I, DARIUS T. WADHAMS, a citizen of the United States, residing at Oswego, in the county of Oswego and State of New York, have invented certain new and useful Improvements in Paper-Cutting Machines; and I do declare the following to be a full, clear, and exact description of the invention, such aswill enable others skilledin the art to which it appertains to make and use the same. i

This invention relates generally to paper-j cutting machines, and particularly to the pressure-producing mechanism for such machines of the type shown in United States Letters Patent No. 623,089, dated April 11, 1899.

The object of the invention isttovprovide means whereby a heavy, strong, one-piece clamp may be used and the same operated by a treadle without undue exertion on thepart of the operator.

The invention consists in the parts and combinations of parts hereinafter fully described,

I and pointed out in the claims.

Inthe accompanying drawings, forming a part of this spec1ficat1on,-F1gure 1 1s a slde elevation of thepressure mechanism of a paper-cutting machine shown in position on mounted on shaft E and adapted toengage' and operate the friction device arranged on the clamp-shaft G. The friction device consists of a casing H and a jaw or? lever I, which is pivotally secured between the extended ears of the casing and carries a roller J for the cam F to engage. Two pawls K are pivotally hung to-the casing and are also connected to the jaw or lever I by links L, and said pawls are held properly extended from the jaw or lever by springs M. The pawls engage a ratchet ringor wheel N between friction-disks O.

A full description of the parts mentioned above may be found in the patent .to Edward M. Lockwood, numbered 623,089, dated April v11, 1899, for a paper-cutting machine, and

they form no part of my presentinvention. A lever m for regulating the position of the friction device relative to the cam is also provided, as described in said patent.

' Upon reference to the drawings it will be seen that the jaw or lever I is shown open that is, with the pawls K disengaged from the ratchet N, which is the normal position of the parts, so that the clamp-shaft with the ratchet and disks are free to rotate in the pressure-lever casing. When in this position, it is evident that almost the whole weight of the casing is carried by the friction-disks, which are keyed to the clamp-shaft, thereby render: ing it'necessary to overcome the friction between the lever-casing and the friction-disks in order to permit of therotation of the clampshaft.

Now it is the mainobject ofmy invention to remove the weight of. the casing from the disks and -transfer"it to the frame of the machine, and-this I-accomplish by means of a track or way'P, bolted to the upper part a of the casing and following approximately the curvature of said casing and providing a cylindrical case R, which is bolted to the main frame of the machine. by a bracket S, within which a coiled spring T is suspended, the lower end of said spring being connected to a sliding block U, which carries a roller? in its forked end. The forked end of the block is of a size to receive the track or-w'ay betweenit and the roller V, and thus afford a support for the casing.

The clamp b is provided with the straps 0, having the rack-blocks d at their lower ends, which mesh with the .pinions e on the clampshaft G. A wheel f is secured to the clampshaft G, and to this wheel is secured one end of a chain 9, the other end of which passes through an opening in a treadle h and being secured against withdrawal therefrom by a washer c', fastened thereto. The treadle is pivoted in uprights j at the rear of the machine and carries a counterbalancing weight is, adapted to normallyhold the tread le at its highest point until depressed by the operator. The clamp is supported by springs, (not shown,) as described in Patent No. 680,655, dated August 13, 1901, which act to return it to its raised position. The depression of the treadle serves to rotate the clamp-shaft and through the pinions 0 and rack-blocks d brings the clamp down to its work. Thus it will be observed that the weight of the casing being removed from the disks and the clamp-shaft by the spring T the clamp-shaft can be more readily rotated to bring the clamp down, since the friction between the disks and the casing is removed, and the operator has only to overcome the tension of the springs which support the clamp and the friction between the clamp-shaft and its bearings. Also by reason of the removal of the weight of the easing from the clamp-shaft and the consequent obviation of friction the tension required on the springs to return the clamp to its top position can be proportionately diminished, which renders it still easier to depress the foot-treadle to bring down the clamp to its work.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

' 1. A clamping mechanism for paper-cutti ng machine, comprising a clamp, a clamp-shaft, a friction device for increasing and maintaining the pressure on the clamp, and means for removing the weight of the friction-device casing from the clamp-shaft.

2. A clamping mechanism for paper-cutting machine, comprising a clamp, a clamp-shaft, a friction device arranged on the clamp-shaft, means for suspending the friction-device casing from the frame of the machine, and a treadle connected to the clamp-shaft for rotating the same.

3. A clamping mechanism for paper-cutting machine, comprising a clamp, a clamp-shaft, a friction device arranged to operate the clamp-shaft, and a spring for sustaining the weight of the friction-device casing.

L. A clamping mechanism for paper-cutting machine, comprising a clamp, a clamp-shaft, a friction device arranged on the clamp-shaft, a trackway connected to friction-device casing, a roller arranged to travel on said track or way, and aspring carrying said roller and suspended from the frame of the machine.

In testimony whereof I afiix my signature in presence of two witnesses.

DARIUS T. VVADHAMS.

Witnesses:

F. K. BARNHART, P. J. CLANOY. 

